I have seen a question related to this once before. So I had searched and read about photographic films. They contain silver halides, when exposed to light metallic silver is formed which is responsible for the picture.@Viraam_Rao

@Viraam_Rao
No, bro read last line, NaCl is added first and ppt of AgCl is formed, now they are asking in which all solutions will it dissolve and in the explaination also it's written, it forms complex with NaCl conc.